Fix gap & padding control default values

[bkrmendy]

Problem

#5981

The padding and gap controls are not resilient to tailwind classes

Fix

Make the padding and gap controls always fall back to the values coming from the actual DOM measurements if they can't read the appropriate values from the style prop (because it's not there)

Manual Tests

I hereby swear that:

• I opened a hydrogen project and it loaded
• I could navigate to various routes in Preview mode

[github-actions]

Try me

[relativeci]

#13131 Bundle Size — 62.24MiB (~+0.01%).

69ddb6a(current) vs 6339ece master#13129(baseline)

Warning

Bundle contains 51 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 regression

	Current #13131	Baseline #13129
Initial JS	45.3MiB(~+0.01%)	45.3MiB
Initial CSS	0B	0B
Cache Invalidation	21.58%	21.57%
Chunks	30	30
Assets	33	33
Modules	4302	4302
Duplicate Modules	523	523
Duplicate Code	31.84%	31.84%
Packages	448	448
Duplicate Packages	51	51

Bundle size by type   2 changes 1 regression 1 improvement

	Current #13131	Baseline #13129
JS	62.23MiB (~+0.01%)	62.23MiB
HTML	11.16KiB (-0.33%)	11.2KiB

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